[nrf52] Test that the mcumgr image is offered beside a UF2 (#19804)

tests/unit_tests/test_download_types.py

@@ -50,3 +50,37 @@ def test_recorded_firmware_path_yields_downloads(platform: str, tmp_path: Path)
     assert all(
         {"title", "description", "file", "download"} <= entry.keys() for entry in types
     )
+
+
+def _nrf52_files(tmp_path: Path, *built: str) -> list[str]:
+    """The files nrf52 offers for a build directory holding *built*."""
+    (tmp_path / "zephyr").mkdir()
+    for name in built:
+        (tmp_path / name).touch()
+    storage = _wizard_storage()
+    storage.firmware_bin_path = tmp_path / "firmware.bin"
+    return [entry["file"] for entry in _download_types("nrf52", storage)]
+
+
+@pytest.mark.parametrize(
+    ("built", "expected"),
+    [
+        # Adafruit bootloader with the mcumgr OTA: MCUboot is chained behind it.
+        (
+            ["zephyr/zephyr.uf2", "zephyr/app_update.bin"],
+            ["zephyr/zephyr.uf2", "firmware.zip", "zephyr/app_update.bin"],
+        ),
+        (["zephyr/zephyr.uf2"], ["zephyr/zephyr.uf2", "firmware.zip"]),
+        (
+            ["zephyr/merged.hex", "zephyr/app_update.bin"],
+            ["zephyr/merged.hex", "zephyr/app_update.bin"],
+        ),
+        (["zephyr/merged.hex"], ["zephyr/merged.hex"]),
+        ([], ["zephyr/zephyr.hex"]),
+    ],
+)
+def test_nrf52_offers_the_mcumgr_image_whenever_it_was_built(
+    tmp_path: Path, built: list[str], expected: list[str]
+) -> None:
+    """The mcumgr update image is offered beside a UF2 as well as beside a HEX."""
+    assert _nrf52_files(tmp_path, *built) == expected